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collect extra information (driver_vendor, gl_renderer, etc.) on Mac/linux.
Note that this CL takes some code from rlp's long outstandingCL (with her
permission).

BUG=49579
TEST=unittest

Review URL: http://codereview.chromium.org/6346007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72055 0039d316-1c4b-4281-b951-d872f2087c98